The function f is defined by $$\(\mathrm{f}(x)=1-4 x-x^{2}\)$$ for all real values of $$\(x\)$$. Find the range of $$\(f\)$$. The function g is defined by $$\(\mathrm{g}(x)=1-4 x-x^{2}\)$$ for $$\(x \geqslant k\)$$, where $$\(k\)$$ is a constant.

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